vicars



(No Model.)

J. VICARS', THE ELDER, T. VIGARS & J. VIGARS,

THE Y'OUNGER. MECHANICAL STOKER.

No. 606,607. Patented @une 28,1898.-

m p a 1 w R m\ I Q m a f M 13% X Mm \WWW MN MW 0.. wgsnmcnon a c JOHN V1OARS, EL'DER, oF BooT, AND THOMAS VICARS ,AND JOHN 'VICARS," THE YoU-NeER, or LIVERPOOL, ENGLAND-" I, MECHANICAL STOKER,

SPECIFICATIONfOrrninQ paltof Letters Patent NO. 606,607, datedJ'une 28, 1898. .1 Application filed December 21, 1897 $611M Fig-662.928. 0 model) Patented in England November 30, 1895, No. 22,929.

' of which the following is a specif cation.

nections.

This invention relates mainly to furnaces in which mechanically-operated appliances for feeding andxdonveying the fuel into and through the furnace are employed; and it consists in improved apparatus for reciprocating fire-barsendwise, as hereinafter more fully described, and set forth in the claims.

In the drawings, Figure 1 is a sectional side elevatio'n of the fire-bars and theirfconf Fig. 2 is a partial plan View of the same, and Fig. '3 is a sectional detail show; ing the device for adjusting the motion of the bars. i I r In the drawings, referring to Figs. 1 and 2, 1 1 are fire-bar's resting alternately on crossbearers '2 2.

3 4 are reciprocating keys or yokes attached at one of their ends to the cross-bearers 2 2, respectively, and at their other ends surrounding the driving-.shaft 5. A pair ofeach of these keys are used, one of each pair at each end of the "cross-bearers at the sides of the furnace; v

6 is a tooth on the key 3,1 against which, as the shaft 5 rotates, a dog or projection 7 acts, so as to push forward the said key with cross bearer 2 and attached fire-bars 1. The cross:

bearer 2 in its forward motion comes-against shoulders 1 on the fire-bars 1 and carries them forward with it and also thecross-bearer 2 and key 4. As the shaft 5 continues to r0; tate the dog 7 comes against a tooth 8 on the key 3 and draws such keybackward, together With cross-bearer 2 and fire-bars 1, the key 4, cross-bearer 2, and fire-bars lkbeing meanwhile prevented from "moving backward by is well-known, Bythe above means a positive and certain alternate backward motion is given to the fire-bars.

Referring particularly to Fig 3, in order to allow of a varied traveLbeing given to the Any convenient fire-bars we attach the t'eet1i6 of the pair of keys 3 to bars 13, free to slide in guides in T the saidkeys 3 and secured in position by pawls 14, taking intora'cks 15 on the bars 13. By drawing out the bars 13 in the direction of the arrow the dogs 7 come in contact with ,the'teeth 6 sooner, and greater forward travel is-givento the keys 3 andj'thereby to the "whole of the fire-bar's, the return motion being asbefore described, or if the friction between the alternate fire-bars 1 l is sufficient the forward travel of the fire-bars during a certain fixed portion of the back travel the bars must move alternately. i :.When the adjustable bars 13 are employed, We prefer to make the cams 10 of shorter throw than when fixed teeth 6 are used on the keys 3.-

The fire-bars 1 1 are made with the rear portions 1* detachable and secured to the front portions by projections 20, fitting into recesses 21, so that the rear portions can be renewed when worn independently of and without disturbing the front portions. 22 are V-joints for preventing lateral movement of the rear portions.

23is a bar or bearer attached to-the sides of the furnace at 24 for supporting the firebars at the junction of the front and rear portions.

25 is the usual bar for support-in g the back end of the rear portion of the fire-bars.

\Ve claim- 1. In a mechanical stoking apparatus, a set of fire-bars alternately connected to separate cross-bearers, a rotatory shaft having actuating connections with the bearers, arranged to give asingle forward, and alternate backward motion to the fire-bars, and a cam upon the shaft arranged to hold one set of bars against backward movement during a portion of the rotation; substantially as described.

2. In mechanical stoking apparatus, the combination with a set of fire-bars, of separate cross-bearers connected to alternate firebars, one series of bars having keys 3 with teeth 6 and 8, a rotating shaft having projections arranged to act upon the teeth, and keys at having teeth acted upon by projections on the shaft, and connected with the other fire-bars, and stops upon one series of bars arranged to contact with a cam upon the shaft, to prevent backward motion of the series during a part of the revolution of the shaft; substantially as described.

3. In mechanical stoking apparatus, the combination with a rotary shaft having proj ections or dogs, of separate keys having projections engaged by the dogs, at least one of the key projections being located upon an adjustable bar carried in the key, and fire-bars connected alternately to cross-bearers actuated by the keys, the connection being arranged to give a single forward motion of variable extent, and alternate backward motion to the fire-bars; substantially as described.

4. In mechanical stoking apparatus, a set of fire-bars alternately connected to upper and lower cross-bars, actuating connections between the cross-bars and a rotatory shaft, the cross-bar of one set of fire-bars being arranged to move the other bars forward, and a cam upon the shaft arranged to prevent rearward movement of one set of bars during a portion of the rearward stroke of the other bars, substantially as described.

5. In mechanical stoking apparatus, a firebar made in two parts, one of said parts having an end groove and a vertical slot, and'the other part having a lug to enter the slot, and a reduced end portion arranged to fit in the groove and prevent side movement, and a support for the bar located beneath this loose connection; substantially as described.

JOHN VICARS, THE ELDER. THOMAS VICARS. JOHN VICARS, THE YOUNGER.

\Vitnesses to the signature of John Vicars, the Elder:

JOHN CUMMINS, JOHN CARTER.

Witnesses to the signatures of Thomas Vicars and John Vicars, the Younger:

W. B. JOHNSON, J. RICHMAN. 

